linux-kernel - [PATCH v2 10/24] ptrace: cleanup arch

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Date:	Fri,  3 Sep 2010 00:46:17 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Roland McGrath <roland@...hat.com>, Oleg Nesterov <oleg@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: [PATCH v2 10/24] ptrace: cleanup arch_ptrace() on h8300

Use new 'regno', 'datap' variables in order to remove duplicated
expressions and unnecessary castings. Alse remove checking @addr
less than 0 because addr is now unsigned.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
---
 arch/h8300/kernel/ptrace.c |   30 +++++++++++++++---------------
 1 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/h8300/kernel/ptrace.c b/arch/h8300/kernel/ptrace.c
index ef1aa0b..7388697 100644
--- a/arch/h8300/kernel/ptrace.c
+++ b/arch/h8300/kernel/ptrace.c
@@ -54,24 +54,25 @@ long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	int ret;
+	int regno = addr >> 2;
+	unsigned long __user *datap = (unsigned long __user *) data;
 
 	switch (request) {
 	/* read the word at location addr in the USER area. */
 		case PTRACE_PEEKUSR: {
 			unsigned long tmp = 0;
 			
-			if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
+			if ((addr & 3) || addr >= sizeof(struct user)) {
 				ret = -EIO;
 				break ;
 			}
 			
 		        ret = 0;  /* Default return condition */
-			addr = addr >> 2; /* temporary hack. */
 
-			if (addr < H8300_REGS_NO)
-				tmp = h8300_get_reg(child, addr);
+			if (regno < H8300_REGS_NO)
+				tmp = h8300_get_reg(child, regno);
 			else {
-				switch(addr) {
+				switch(regno) {
 				case 49:
 					tmp = child->mm->start_code;
 					break ;
@@ -89,24 +90,23 @@ long arch_ptrace(struct task_struct *child, long request,
 				}
 			}
 			if (!ret)
-				ret = put_user(tmp,(unsigned long *) data);
+				ret = put_user(tmp, datap);
 			break ;
 		}
 
       /* when I and D space are separate, this will have to be fixed. */
 		case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
-			if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
+			if ((addr & 3) || addr >= sizeof(struct user)) {
 				ret = -EIO;
 				break ;
 			}
-			addr = addr >> 2; /* temporary hack. */
 			    
-			if (addr == PT_ORIG_ER0) {
+			if (regno == PT_ORIG_ER0) {
 				ret = -EIO;
 				break ;
 			}
-			if (addr < H8300_REGS_NO) {
-				ret = h8300_put_reg(child, addr, data);
+			if (regno < H8300_REGS_NO) {
+				ret = h8300_put_reg(child, regno, data);
 				break ;
 			}
 			ret = -EIO;
@@ -117,11 +117,11 @@ long arch_ptrace(struct task_struct *child, long request,
 			unsigned long tmp;
 			for (i = 0; i < H8300_REGS_NO; i++) {
 			    tmp = h8300_get_reg(child, i);
-			    if (put_user(tmp, (unsigned long *) data)) {
+			    if (put_user(tmp, datap)) {
 				ret = -EFAULT;
 				break;
 			    }
-			    data += sizeof(unsigned long);
+			    datap++;
 			}
 			ret = 0;
 			break;
@@ -131,12 +131,12 @@ long arch_ptrace(struct task_struct *child, long request,
 			int i;
 			unsigned long tmp;
 			for (i = 0; i < H8300_REGS_NO; i++) {
-			    if (get_user(tmp, (unsigned long *) data)) {
+			    if (get_user(tmp, datap)) {
 				ret = -EFAULT;
 				break;
 			    }
 			    h8300_put_reg(child, i, tmp);
-			    data += sizeof(unsigned long);
+			    datap++;
 			}
 			ret = 0;
 			break;
-- 
1.7.2.2

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